I could figure out that if I delete all the codes for sheet1 and sheet3, I get no error
So the error only comes from the sheet1 and sheet3 codes
But at the same time, I couldn't figure out where is the issue coming exactly from

It seems something is wrong with your network.
The URL https://jsreport.net isn't reachable and the default preview can't work without that.

Please refer to this documentation page for the details
https://jsreport.net/learn/office-preview

Yes, thanks that answered my question.

I've done it. It's a little bit complicated, though. So I'd be happy to explain it in detail here, but only if anyone's interested.

In a nutshell:
I simply generated the whole vml. This thread helped me: https://stackoverflow.com/questions/3494856/how-to-add-a-comment-to-a-cell-in-excel-2007-using-the-open-xml-sdk-2-0/20740684

Then I had to feed the files xl/comments1.xml, xl/persons/person.xml and xl/threadedComments/threadedComment1.xml with appropriate data.

Hi Everyone, can we add image dynamically using JS and display on the excel file using .xlsx recipe?

I found some comments regarding this in this forum topic
https://forum.jsreport.net/topic/59/how-to-add-styling-to-cell-font-color-size-background-color-etc-to-xlsx/4

Btw I found it using the forum search button :)
https://forum.jsreport.net/search?term=xlsx style&in=titlesposts&showAs=posts

hi! do you mean the default gridlines that comes with excel?

i think you can only get rid of it if you change background color of multiple cells, to do that you will need to tweak the xml representation of the excel to define the colors, to see how this representation should look like check this reference to the Office Open XML spec

no, but you just need to translate the xlsxAddImage to a function call in ejs syntax.

other thing can be that ejs works different with helpers, and since ejs is external extension (not part of core jsreport extensions) maybe it has some bug when working with xlsx recipe, if that is the case we will need an example link in playground that shows the bug

Thank you for the quick answer!

Great, Thanks again.

Excellent, thanks!